Sewing-machine



(Model.) 3'Sheets-Sheet 1.

J. A. DAVIS.

SEWING MACHINE.

Patented Deo. 20,1881.

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(Model.) 3 Sheets-Sheet J. A. DAVIS.

SEWING MACHINE.

Patented Deo. 20,1881.

IIIIIIII 'WiJmESsEe N. PETERS. Phele-mnugmpner, wnsllmgw". D. C.

UNITED STATES PATENT OFFICE.

JOB A. DAVIS, OF BOSTON, ASSIGNOR TO WILLIAM T. COOK, OF FOX- y BOROUGH, MASSACHUSETTS.

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SPECIFICATION forming part of Letters Patent No. 251,195, dated December 20, 1881.

Application led February 1, 1881. (Model.)

To all whom it may concern:

Beitknown that I, JOB A. DAvIs, of Boston, in the county ot Suffolk and State of Massachusetts, have invented certain newand useful Improvements in Sewing-Machines, of which the following is a full, clear, and exact description.

This invention relates more particularly to that class oi'sewing-machines employing a continuons rotating shuttle or under-thread carrier and a rectilinear reciprocatingeye-pointed needle or upper-thread carrier; but some parts ot' it, as will be obvious from the description hereinafter given, are applicable as well to other classes of sewing-machines.

This invention consists, rst, of mechanism for operating the feed; second, of mechanism for operating the needle-bar, the feed-bar, and

the presser-foot third, of mechanism fordriving a continuous rotary shuttle, whereby it Ais made to move at a speed greater at one part of its travel than at the remaining part; fourth, of a continuous rotary shuttle having an elongated eye; iit'th, of a device for deecting the needle-thread from the path of the shuttle; sixth, of mechanismv for confining and releasing a continuous rotating shuttle in a direction atrightangles toits path of rotation; seventh, ot an upper and lower feed-bar, arranged, the lower feed-bar to work in one direction from and with the upper feed bar and inthe other direction independently of such upper feed-bar and by mechanism of its own; eighth, ofa rotary shuttlecarrier constructed to place and keep the needle in its properline ot' movement; and, ninth, of a construction oft-he raceway for a rotary shuttle-carrier and its shuttle, all substantially as hereinafter described.

In the accompanying plates of drawings this,l invention is illustrated.

In Sheet l, Figure l is an elevation of the front sdeof the machine; Fig. 2, a detail view of the connecting mechanism between the upper anddriving shaft and the shaft drivinglthef rotary shuttle; Figs. 3 and 4, enlarged venti-1' cal and horizontal sectional detail views, respectively, of a portion of Fig. 2. Fig. 5.i s a perspective view, Fig. 6 a rear view, Fig. 7 a side view, and Fig. 8 a detail sectional view, of the shuttle. y

` In Sheet 2, Fig.9 is an elevation of the needle, presser, and upper and lower feed bars, and of their operative mechanism; Figs. 1() and 12,

vertical and hoxizontal sections, respectively Y sitions beingindicated by dotted lines; Figs. 15,

16, and 17, horizontal sections on lines 15 15,16 16, and 17 17, respectively, ot' Fig. 9, Sheet 2;

Fig. 18, an elevation of the open end of the shuttle-race with the under feed-bar removed Fig. 19, an edge view of Fig. 18, showing the shuttle-carrier and needle; Fig. 20, an elevation of the shuttle-carrier with the shuttle removed; Fig.^21,.an elevation of the shuttlerace back of the shuttle-carrier; Fig. 22, a horizontal cross-section on line 22 22, Fig. 21, showing, alsoin section, the shuttle-carrier and shuttle.

.In the drawings, A represents the bed-plate ofaseWi ng-machine, havingagoose-neckstandard, B, which is the support for a horizontal driving-shaft, C, having at one end a grooved driving-pulley wheel, D, and a balance-wheel, E. This driving-shaft G terminates in achambered head, F, of the standard B, and therein it is provided with two separate peripheral cams, G H, and a crank-arm, K, having a friction-roll, a, each in a separate and distinct vertical plane.

L is a needle-bar, M a presser-har, and N an upper feed-bar. These several bars are located at the chambered head F of the standard B, and they are there arranged side by side, with the feed-bar between the needle and pressenbars, each to be moved separately and independently of the others and in a vertical plane at right angles to the bed-plate. The needle-bar L carries a plate having a camgroove, b, which sets over the friction-roll a of the crank-arm K, and thus the needle-bar is moved up and down as the driving-shaft rotates, said needle-bar being guided ini-such movement by suitable guideways of the walls ofthe chambered head F.

The presser-bar M is pivoted at c to a U- IOC shaped frame or tumbler, 0, which straddles and bears against the two opposite sides of the periphery of the cam G, and under the revolution of this cam, operating on one of the legs 5 of the tumbler O, the presser-bar is raised, and by the cam acting on the other leg of the tumbler the presser-bar is moved in the opposite or downward direction, and both ofsuch movements are in suitable guideways in the walls 1o of the chambered head. A spiral spring, d, acts to hold the presser-bar to the goods being sewed, in the usual manner.

The feed-bar N has a link, f, which at one end is pivoted to it and at the other end to the tumbler' O, and it has a slot, h, running in the direction of its length, which slot sets over a stud, k, carried by a lever-arm, P, that turns upon afulcrum-pin, l, of a horizontal slide-bar, Q, and bears against the periphery of the cam 2o H, a spring, m, suitably applied to thelever P, holding it to such bearing. The upper part of the feed-bar N has a slot, a, along its length, and by this slot it slides over a guide-block, o, pivoted to a wall of the chambered head F. The rotation of the cams G H-the one, G, through the tumbler O and the other, H, through the lever-arm P-gives respectively an up-and-dow'n movement and a forwardand-backward horizontal movement to the feed-bar in relation to the bed-plate A, the walls of the chambered head F- being provided with suitable guideways, to allow ofthe same. The slide-bar Q, hereinbefore referred to as carrying the fulcrum of the lever-arm P, plays at one end through a guideway,p, of the charnbered head F, and at the other end a screwbolt, q, freely enters it. Said bolt q screws into and through one side of the chambered head, and exteriorly is provided with a milled head, 4o for conveniencein turningit. By this arrangement of parts the fulcrum of the lever on the slide-bar Q and the connection between such lever and the feed-bar are rendered adjustable in relation to the bearing of such lever against the edge of its cam H, and thus the length of the horizontal movement of the feedbar, and consequently the feed of the material being sewed, can be regulated as desired.

The needle-bar carries the needle 1', which 5o is suitably attached thereto, and this needle, :in its up-and-down movement, plays through the throat s of the cloth-plate R, making a part of the bed-plate. The foot-piece S of the Vupper feed-bar, N, is shaped to pass in its hori- 'zontal movement aforesaid to one' side of the needle-throat-to wit, between such throat and the upright part of the standard .B-and to the rear of the needle-throat in relation to the direction of feed of the goods through the machine, (shown by the arrow, Fig. 9,) and its bottom and acting face is preferably serrated',4

or otherwise roughened. y The foot-piece Tof thepresser-bar M is shaped to ass to the left of both the foot-piece of the feed-barV and needle-throat s and to the front.-

side of the latter, and it is suitably cut out for the footpiece ofthe feed-bar and the needle to move under the action of their operating mechanism.

U is a horizontal shaft, placed below the bedpieceA with its axial line coincident with the vertical plane of the axial line of the drivingshaft. This lower shaft, U,is driven from the driving-shaft C by connecting mechanism consisting-of an eccentric, V, xed to the drivingshaft, and a strap, W, surrounding said eccentric. This eccentric strap W is a continuation, of a connecting-rod, X, and intermediate of its length said rod carries a slide-block, t, on which it turns by a pivot-pin, u, said block being argo lranged to play within and along a vertical guide-groove, o, of the upright part to the standard B. The direction of this guide-groove is in a vertical plane coincident with the vertical plane'of the axis of the two shafts. This rod 85 of the eccentric-strap, at its lower end, has a stud-pin or friction-roll, w, which projects into a radial slot, m, of a vertical disk, Y, fastened to the lower shaft, U. The distance between the axis of the intermediate fulcrum-pin, u, of the connecting-rod X and the axis of the eccentric-strap W should be always exactly half of the distance between the axes of the two shafts C U, and the distance between the axis i of the lower pin or stud, tu, and the axis of the intermediate fulcrum-pin, u, should be always less than the distance between the axis of such fulcrum-pin u and the axis of the eccentricstrap W. This lower shaft, at its end opposite to that connected to the driving-shaft, as above described, carries a concentric circular disk, Z, which rotates with it, and in such rotation turns within a stationary concentric circular chamber, A2, of the block B2, fixed to the under side of the bed-piece, which chamber is the shuttle-race of the machine. The outer face of this disk Z has a fixed block, C2, which occupies a portion of its surface, and is shaped tomake a rest for the point y and heel z of a shuttle, D2, of a crescent shape, and to no leave an open space, a2, intermediate of such rests of the shuttle against it and between it and the shuttle. This block C2, together with its carrying-disk Z, is the shuttle-driver of the machine. The shuttle D2 lits the inner periph- I 15 ery of the circular chamber or shuttle-race A2, and it is carried around the same under the revolution of the lower shaft, U, and its shut-l tle-carrier C2. The shuttle, between its point and heel,is chambered in its thickness, and in 12o this chamberis a bobbin or spool of thread, b2, turning upon a center post, c2, of the shuttle, and the thread passes from this bobbin to and under a spring pressure-disk, d2, of the shuttle,y and thence to an eye, f2, in the wall of the chamber of the shuttle, which eye is coincident )with the axis of the lower shaft, and thus the f'shuttle-thread is delivered to the action of the I needle, as will hereinafter appear, and through the pressure-disk d2 the desired tension on the 13o same is obtained.

The location of the shuttle and its rotation within 'and around its race, as above described, are such relative to the up-and-down movement `lowerni ost of the needle under the action of its bar L and mechanism connected therewith, as described, that its point, which is at the periphery ofthe shuttle-race, will pass above the eye of the needle and between the needle and its thread when the needle has slightly receded from its position, and thus formed a loop of the thread. The outer face of the block C2, making a partot' the shuttle-carrier, is situated in such relation to the up-and-down movement of the needle, as aforesaid, that as it rotates to carry the shuttle around it will pass to the right of the needle in its downward movement, and as the needle moves downward and passes the same it will be in such position relative thereto that in case the needle is out ot' its proper vertical line it will then bear against and press-the same into position for the point ot' the shuttle to enter the loop of the shuttlethread, and thus the needle is positively conlned and held for such operation, should it in any way, by reason of its being bent or otherwise, be running in a line out of its proper path relative to the path ot the point of the shuttle.

The open end E2 of the shuttle-race A2 is y closed topreventthe escape of the shuttle from it in the rotation of the shuttle within it by two arms, F2 G2, one, F2, of which acts as an uuder or auxiliary feed-bar, to be explained hereinafter. The other arm, G2, swings upon-a pin, g2, and it has a spring-catch, 11,2, which interlocks with a notch ot the shuttlerace block B2 when such arm is in its closed position over the open end of the shuttle-race, and on a release of this spring-catch Tt2 this arm can be swung out of position for the removal ol' the shuttle from its race.

Theunder or auxiliary feed-bar, F2, making also one of the closing-arms to the open end of the shuttle-race A2, as above stated, is secured at its lower end to a horizontal rocker-shaft, H2, which is arranged to rock in bearingsvot' the under extension of the shuttle-race block face,

B2, and has a radial arm, 12, which at its free end bears against the periphery or edge of the cam J2 on the lower shaft. The upper end of this under or auxiliary feed-bar, at its working which preferably is serrated or otherwise roughened, lies within an opening,j2, in the cloth-plate, and it'may be either ush with or project slightly above said plate,and such working face is shaped to correspond to that of the working face of the Lipper t'eed-bar, as herein described. The Linder or auxiliary feed-bar swings forward and backward within given limits within this opening]2 ofthe clothplate, which is ot' suitable shape and size therefor, and its .forward movement is with and in consequence of the similar movement ot' the upper feed-bar, and its backward movement becauseof the action of the cam J2 on the .radial arm 12 of its rocker-shaft H2, as will hereinafter fully appear.

The outer `face ot' the shuttle-carrier C2 has afraised rib or projecting piece, k2, the outer edge of which runs at an incline thereto, and

it is otherwise so shaped and situated between the eyef2'ot` theshuttle D2, for the delivery ot' the shuttle-thread, and the periphery of the shuttle-race, and in such relation to said shuttle-eye, that 'under the rotation of the carrier it will in no manner interfere with the travel of the needle, and that as it. passes around the shuttle-thread leading from the shuttle-eye to the needle-throat ot' the cloth-plate, in the making ot'each stitch, will begin to ride or pass upon itjust previous to the entrance ot' the point ofthe shuttle between the needle and its thread or into the needleloop, as herein described, and will continue to so ride upon and passfover it until such point of the shuttle has entered the needledoop, when it will drop from the same tothe outer face ot' the shuttle. and thus the shuttle-thread is placed ont of or detected from the line of movement ofthe shuttle-point at such time, and all possibility otinterference between it and the point ot the shuttle is prevented.

l2 isa. button or plate, which projects from the front o'r outer face of' the disk Z, making a part of the shuttle-carrier, and is in position to lie against thevinner face of the shuttle as it travels around within its race. VThestem or shankm2'of this button Z2 entersinto and passes through the thickness ofthe said disk, and at its inner end it has a head-piece, n2, which rests and bears against the inner face ot' the shuttle-race, and such shank to said button is of suitable length for the button to have a lateralplay relative to the thickness ot' said disk. Aportion ot' the said inner face ofthe shuttlerace, against which the said head n2 to the button Z2 bears in the rotation ot' the shuttle-can rier, has a depression, o2, of suitable shape tor it to enter,xand the remainder ot `such inner face along said line ot' bearing is flat and in a parallel plane with the vertical plane of rotation of the shuttle and its carrier. In the rotation of the shuttle and its carrier, as the head of this button travels over the til-at portion of its bearing=face in the shuttle-race the buttonis pressed outwardly against the shuttle, which, in turn, is thereby pressed outwardly against the arms F2 G2, which close the open end of theshuttle-raee, and as the said head travels over the depressed portion ot' its said bearing-face the outward pressure ot' the button upon and. confinement of the shuttle, as aforesaid,,isrreleaseth and' the shuttle isthus left free to move laterally toa limited extent within its shuttle-raceasitthen rotates around and'through the same.

The at and depressed portions of the bear ing-face forthe bntton-headfn2 above described are situated in such relation to each otherand to the movementot the shuttle through its race that the pressure upon and confinement ot' the shuttle against the arms which hold the shuttle against escape from its race will commence just previous to the entrance ot' the shuttlepoint into the needle-loop in the making ot" a stitch, as herein described, and continue till suchentrance is effected and for a short por IOO lIO

tion of the rotation thereafter, but will certainly be released because of the backward play allowed to the button by thedepression 02 in time for the needle-thread to freely pass between the inner side of the shuttle and the contiguous face of the disk Z to the shuttlecarrier and its button 12in the continued rotation ot' the shuttle. This release of the pressure of the button against the shuttle continues until the shuttle is again about to entera needle-loop, when it again occurs, an'l so continues, as before, and so on for each rotation of the shuttle. By these means the shuttle is brought and held positively in position rela.

tive to the needle-loop, when it is to talie such loop, and afterward it is given suicient freedom of lateral movement in its race to allow the loop of theV needle-thread to pass freely about and around the shuttle as the shuttle continues to enter it, and similarly to pass freely between the shuttle and its race in its escape therefrom in the after completion of the stitch, by the drawing up of such loopin the running of the machine.

K2 is the spool from which the needle is supplied with thread. This thread passes from its spool to and between a horizontal plate,p2, and the periphery ot' a vertical wheel, q2, arranged to turn within the bracket-arm B. The plate 3o p2 rests upon the wheel, and it is held in contact therewith by the pressure ofa spiral spring, r2, which surrounds a post, s2, and is adapted by a screw-nut, t2, to be adjusted as to its pressure upon the plate, and thereforeas to the pressure of the plate upon the wheel. These parts constitute the. tension device of the machine, and by arranging one of them to roll or turn as described there is no possibility ofthe thread being obstructed in its passage between them, while at the saine time the desired restraint or tension on the thread will always be maintained. From the tension device the needle-thread passes to and through a stationary eye, a2, and thence under a stationary hook, v2, below such eye, which are upon the chambered head F of the standard B, to and through an eye, to2, at the outer end of an arm, L2, that is arranged to swing unon a pivot, x2, at the rightof said chambered head F, and to enter, by a stud or pin, 12, into and engage with a peripheral cani-slot, z2, of the driving-shaft C, and from thence to the eye of the needle, entering the same at the lett-hand side thereof, Fig. 1. This arm acts as a take-up or con troller of the needle-thread, and its said swing is in a vertical direction between the said stationary eye u2 and hook '02, and at its said point ofsuspension and connection with the cam-slot z2 it is in frictional contact with a plate, M2, attached by set-screw a3 to the goose-neck standard B in proper position therefor. This thread take-upor controller, throughthe working of its operating-cam z2, is given an upwardaud-downward movement. Thismovement is such in relation to the downward travel of the needlethat its downward movement, begins after the needle commences to move downward,

and so continues, even after the needle has begun to move upward, and so long as the shuttle in its rotation continues to draw the needlethread downward through the eyeot' the needle and the cloth being sewed, when its upward movement commences and continues, ending just after the upward movement of the needle, when it rests, and again begins its downward movement at'terthe needlehas begun its downward movement, and so on, as before. This rest ot said take-up or thread-controller, after its upward movement and ofthe similar movementoftheneedle,as aforesaid,holdsthethread ruiming from it to the eye of the needle under a suitable tension to insure the proper disposition of such thread by the needle, as the needle enters the cloth for the after-taking of the needlethread by the point of the shuttle. These movements and rests ot' said thread take-up or controller are produced, as before stated, from the cam-groove z2. This groove, in its part for giving the rest to said takeup arm, as aforesaid,is slightly widened as to the diameter ofthe stud-pin or friction-roll y2 running in it, so as to allow to said take-up arm sufficient play in its said operating cam-slot z2, by moving against its friction-holding plate M2, for it to move downward, even before the part of the cam-groove which is shaped to produce such movement has come into operating position thereon, should there be any increased tension in the needle-thread on the downward travel ot' the needle because of any then increased thickness in the goods heilig sewed.

Vith the connection herein described between the driving and lower shafts, C U, as the axis of the eccentric V moves from its highest toits lowest vertical position relative to the axis of the driving-shaft, andin either direction of the turn ofthe eccentric, the axis ofthe stud w approaches the axis of rotation of the lower shaft, and as the axis of the eccentric moves from its lowest to its highest vertical posit-ion relative to the axis ot' the drivingshaft, and in either direction of the turn ofthe eccentric, the axis of said stud recedes or moves away from the axis ot' rotation ot' the lower shalt, and such radial distance is the greatest when the axes of the eccentric and of the stud are in their highest position, which is when they are in a vertical line coincident with the vertical line of the axes of the driving and lower shafts, and from such greatest radial distance the radial distance gradually diminishes, in whichever direction the eccentric is turned, until -the axis of the stud reaches the horizontal plane ot` the axis of the lower shaft, when such axis of the stud is nearly at its shortest decreases such relative radial distance in the continued rotation of the lower shaft until the axis of the stud reaches its lowermost position, when, as it moves upward to the horizontal plane .of the axis of the lower shaft,

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v radial distance, and from that time it slightly it begins to slightly recede from the axis ot' l the lower shaft, and thus to increase its radial distance therefrom, and it so continues until the axis of the stud reaches its greatest radial distance aforesaid, when, on a continued rotation of the lower shaft, the axis of the stud again begins to approach the axis of such rotation, and so on, as before. Thus it is obvious that the axis of the stud, in passing through the part of its travel which is above the horizontal plane of the axis of rota-tion of the lower shaft, describes or passes through a circular line of greater length than in the part of its travel which is below the said horizontal plane; and, again, in said two parts of its travel the leverage upon the lower shaft is the longest in the first and the shortest in the second instance, causing in the second instance a quicker movement of rotation of the lower shaft about its axis of rotation than in the first instance, while the travel of the axis of the eccentric about the axis of rotation of the driving-shaft as to such part of rotation of thelower shaft is the same then as to all portions of it as it is in the other partof the rotation of the lower shaft. 1n this sewing-machine this action of the connection between the driving` and the lower shafts, as above described, (by means of a suitable location of the shuttle and its carrier upon the lower shaft relative to the portion of the rotation' of the lower shaft about its axis, which has the quickest movement, as aforesaid, and by means of the operation of the needle under the action of the drivingshaft and connecting mechanism, as aforesaid, relative to and across the plane of rotation of the shuttle,) is caused to impart an increased quickness of movement to the rotary' travel of the shuttle from or about the time the point of the shuttle enters between the needle and its thread and begins to pull such needle-thread downward, and to thus draw and place it about and around the shuttle until the shuttle has reached the position in its travel when such loop of the needle-thread begins to escape from or leave the shuttle, all of which occupies onehalf part, or thereabout, of the whole rotation of the shuttle. By this means the taking of the needle-thread by .and its escape from the shuttle are hastened relative to the operation of the needle and of the thread take-up or controller L2, and to other movements in connection with the making ofthe stitch, by the needle and shuttle threads, and thus the shuttle is made to perform its part in the making of the stitch inthe quickest possible time, increasing the opportunity of theneedle, the thread take-up or controller L2, and the other portions of the stitch-making mechanism to complete the stitch, as well as leaving them to their own separate and combined operations in that regard for a greater portion of the revolution of the driving-shaft than they would have'if a connection and an effect therefrom upon the rotation of the shuttle such as above described were not employed and obtained.

In the several movements abote described the rod which connects the eccentric-strap W and moves by a stud or friction-roll, fw, in and out of the radial slot :v of the rotating disk of the lower shaft, slides by its block t up and down within the guide-groove o therefor.`

This slide-block t (see Fig. 3) is made in three parts. Two of these parts are cutout, as at a, to embrace opposite sides of the pivotal pin u of the eccentric-rod X, and one, In, byits outer edge, c4, fits the wall of its way or groove v, and the other, d4, at and alongits outer edge,f4, tapers or is of wedge shape from end to end, and there receives the remaining part g4,which, along its edge h4 in contact with the' tapered edgef4 of the part d, tapers also, or is of wedge shape in its length, and along its other edge, 4, is straight to t the wall of the slide- Way or groove il for such block, and has a beaded set-screw, lo", that passes through a slot, Z4, running lengthwise of it, and is countersunk therein, and so fastens it to its adjoining part. This construction of the slide-block t enables it to be adjusted to its bearing along the walls of its guideway or groove, to compensate for its wear and the wear of its said bearing, by simply unloosening the set-screw h4, and then forcing the outer wed ge part in the proper direction therefor, and afterward tightening up said screw, all as is obvious without further description.

The eye f2 of the shuttle, at which the thread passes from the shuttle in the making of the stitch, and which, as before stated, is at the axis of rotation of the shuttle, is elongated from said axis and in the line of such rotation of the shuttle, but in the opposite direction thereto-thatv is, toward the heel of the shuttle. When, in the rotation of the shuttle, its point is passing into and through the needleloop the shuttle-thread is passing out of the shuttle-eye at the axis of rotation of the shuttle, which is in line with one end of its elongated eye, and as the shuttle continues its rotation such thread works from such end toward and finally reaches the other end of the eye at or about the time the loop ot' the needlethread is escaping from the shuttle, owing to the upward movement of the needle, and it is then drawn up with the loop of the needlethread by the then upward movement of the take-up or controller of the needle-thread to complete the stitch. By these means, under the rotation of the shuttle, the shuttle-thread between the eye of the shuttle and the clothr being sewed at the time the needle-loop begins to draw off, as aforesaid, from the shuttle, has a length greater than the distance between the cloth being sewed and the end of the elongated shuttle-eye which is then uppermost and the nearer thereto, and this increase in length lof the shuttle-thread over the distance thenbetween such end of the shuttleeye and the clo'th being sewed equals in substance the length of the elongated eve fromV end to end-or, in other words, the distance which such end of the shuttle-eye is to the rear IOO IOS

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ofthat end of the shuttle-eye which is coincident orin line with the axis of rotation of the shuttle. `Thus the shuttle-thread is given a slack for the loop of the needle-thread to handle as it is drawn upr by its take-up or threadcontroller to complete the stitch,'and consequently the needle-thread, of itself, at such time has no labor or strain upon it so far as the shuttle-thread is concerned, which obviously it would have were not the shuttle-eye so elongated and the necessary supply of the shuttlethread been previously given out to the needle-loop, as has been described.

By the location of the shuttle-eye at the axis of rotation4 of the shuttle it obviously is always atthe lsame distance from the cloth as it is sewed; and if not elongated, as has been herein described, the shuttle-thread passing through it to the cloth would at all times be taut, and when required to complete the stitch would have to be drawn oft' from the shuttlebobbin against the tension device of the shuttle by the needle-thread itself as it is drawn up by its take-up and controller; also, the location of the shuttle-eye at the axis ot' rotation of the shuttle is importantin itself, for if other- Wise placed-that is, at either` side of such axis-there would be no control of the shuttlethread for perfect stitching, which obviously would make it impracticable; and while, with the shuttle-eye located at the axis of rotation of the shuttle, the shuttle-thread could be drawn oil to advantage from its bobbin directly and only through the upwardl pull upon it of the needle-loop as it is drawn by its takeup or thread-controller, as described, still the elongation of the shuttle-eye which has been described is very essential, for the reasons which have been given, and for the further reason that it enables the requisite amount of slack in the shuttle-thread to be obtained at and only at the time it is needed. This operation upon the shuttle-thread, because ot' the axial and elongated shuttle-eye, secures a perfect lock-stitch, and thus an elastic seam.

The under auxiliary feed-bar, F2, as before stated, Works in one direction with the forward movement of the upper feed-bar, and in this manner the goods being sewed are griped between the two, and thus, under the action of the mechanism provided for operating the upper feed-bar, their feed of the goods is rendered most positive and sure. In this forward feed of the goods the under or auxiliary feed-bar is entirely free to move with the upper feed-bar and the goods, and the upper Vfeed-bar has no resistance of any kind except the weight of the under or auxiliary feedbar and the resistance incidental to t-he weight of the goods to overcome, all of which obviously is slight, and as the backward movement of the under feed-bar is by and through a revolving cam, J2, such movement is obviously secured in a positive manner, and can be graduated as to its quickness as may be desiredy by suitably shaping the cam J2 therefor.' As to this feed of the goodsby the upper and lower feed-bars, the operation thereof proceeds from the drivingshaft C and its cams G H through the Aconnection between them and the upper feed-bar, and the arrangement of this mechanism is such relative to the mechanism for operating the presser-foot that when the vupper feed-bar is griping the goods between it and the lower or auxiliary feedbar (which preferably is arranged so as to then be in aline directly under the upper feed-bar) and is feeding th'em forward the presser-foot will be lifted from contact with or pressure upon the goods, and'vice versa; and, again, this operation ot' the feed is arranged to occur in proper relation to the travel of the needle and other parts of the machine by which the stitch is formed, as is well known in all sewing-machines.

lt is plain from this description that while three elements-to wit, an upper feed-bar, a presser-foot, and a needleare all worked from a common driving-shaft, they are severally operated'by mechanism from such shaft which acts in itself independently upon its respective parts, and the movement of any one is i-n no sense dependent upon the movement of either or both ot" the others.

Otherwise than has been herein particularly specified, the sewing-machine herein described works in all respects substantially similarly to other machinesof a similar kind,and therefore it is not deemed necessary to herein particularly expl iin the same in such respects, as they are obvious to all conversant with the running and operation of sewing-machines. y

I do not broadly claim a shuttle having an eye at the axis of rotation, as such, of itself, is not my invention.

Having thus described my invention, what I claim, and desire to secure by Letters Patl. The combination, with the upper feed-bar,

N, the cams G H, and driving-shaft C, of the- U-shaped tumbler O, embracing the former cam, the lever P, and a spring, m, all constructed' and arranged together to operate the feed-bar, substantially as and for the purpose described.

2. The combination, with the presser-barM, the cam G, and driving-shaft C, of the U shaped tumbler O, fulcrumed in the presserbar and embracing the said cam, and a spring, d, all constructed and arranged together, substantially as and for the purpose specified.

3. The needle-bar L, the upper feed-bar, N, and presser-bar M, in combination with the needle-bar having the slotted cam l), cams G H, crank-arm K, driving-shaft C, tumbler O, lever-arm P, springs dm,severally constructed and arranged together and connected to the said several bars, all substantially as and for the purpose described.

4. The combination, with a continuous rotating shuttle-carrier and shuttle, of a block,

t, in parts, as described, a guideway, c, on standard D, and a connecting-rod, X, having a fulcrum, u, on block t, hung to eccentric V, ot' a rotating shaft, G, and arranged to move IOO IIO

in aradial slot, x, of a rotating shaft, U, all sub stantially as and for the purpose described.

5. A continuously-rotary shuttle, D2, having an elongated eye, f2, one end of which eye is coincident with the axis of rotation of the shuttle and the other end is toward the heel of the shuttle, substantially as and for the purpose described.

6. A rotary carrier for a continuous rotary shuttle, D2, provided with a raised rib or edge, k2, having its outer edge inelinedwith respect to the shuttle carrier, whereby the needlethread, as it passes the same, will be deflected from the path of the shuttle-point, all substantially as and for the purpose described.

7. A continuous rotary shuttle, D2, and its carrier C2 and raceway A2, in combination with the button Z2 and its head n2, arranged in such raeeway, and with the hat and depressed bearing-face o for such button-head, all substantially as and for the purpose specified.

S. An upper feed-bar, N, arranged to rise and lower and to be moved by mechanism forward and backward, in combination with au under or auxiliary feed-bar, F2, arranged to gripe the material being sewed between it and the upper feed-bar, and to move forward and backward, receiving its forward movement directly from and because of the similar movement of the upper feed-bar, and its backward movement by and through mechanism acting upon it alone and independent of the operation of the mechanism of the upper feed-bar in a similar direction, all substantially as described.

9. An upper feed-bar, N, arranged to rise and lower and to be moved by mechanism forward and backward, in combination with au under or auxiliary feed-bar, F2. arranged for the griping of the material being sewed between it and the upper feedfbar, and to move forward and backward, receiving its forward movement directly from and because of the pressure of the upper feed-bar upon it in the similar movement of the upper feed-bar, and its backward movement by and through a radial arm, I2, secured to it, and a revolving cam, J2, acting together upon it alone and independent of the operation of the mechanism ot' the upper feed-bar in a similar direction,all substantially as described.

10. The combination, with a rectilinear reciprocating needle, r, of a continuously-rotary shuttle-carrier, arranged to pass at one side of said needle and to press or bear by the face of its block C2 against it should the needle be bent or otherwise placed out of its proper line of movement, all substantially as deseribed l1. The racewayA2, having an open end for the continuous rotary shuttle and its carrier C2, in combination with arms F2 G2, closing said open end, the arm F2 being adapted to act as an under or auxiliary feed bar and the arm G2 to be closed upon and opened from the said raceway, all substantially as and for the purpose described. l

In testimony whereof' I have hereunto set my hand in the presence of two subscribing witnesses. Y

JOB A. DAVIS. Witnesses: Y

EDWIN W. BROWN,

W. S. BELLows. 

